The methods "test_sample" and "test_sample_root" for obtaining
the path of the sample file have been added to the TestCase class of
base.py, but the above methods are judged to be test methods and
executed in the UT.
This patch renames and moves the relevant methods from
{tosca-parser_root}/toscaparser/tests/base.py to
{tosca-parser_root}/toscaparser/tests/utiles.py.
Change-Id: If3a2e73d2e9d4a6052fef5db8db74c3da211bc5c
6a95391f17